PGM Mysql PDO WHEN或IF语句

Question

在PDO语句中是否可以有WHEN语句或IF语句？我试过以下，但它不工作

$stmt = $conn->prepare('SELECT company_id, name, alias, fk_company_type as type, is_active as active FROM company WHERE (CASE WHEN :srchBy = "alias" THEN alias ELSE name END) LIKE :srchField'); 

$stmt->bindParam(':srchBy', $srchBy, PDO::PARAM_INT); //bind :srchField to $srchField in sql statement 
$stmt->bindParam(':srchField', $srchField, PDO::PARAM_INT); //bind :srchField to $srchField in sql statement 

表结构

company_id  |23980471998218241 | 23980471998218242  | 
fk_company_type |HQ     |SITE      | 
name   |JOHN PLUMBING HQ |JOHN PLUMBING - BRIDGE ST| 
alias   |CITY RD HQ   |BRIDGE ST SERVICE  | 
is_active  |1     |1      | 
created_date |2015-04-18 19:35:32|2015-04-18 19:34:46  | 

Answer 1

不幸的是，你不能被列名的参数绑定。但你可以做其他的方式

$stmt = $conn->prepare('SELECT company_id, name, alias, fk_company_type as type, is_active as active FROM company WHERE (CASE WHEN "'.$srchBy.'" = "alias" THEN alias ELSE name END) LIKE ?'); 
$stmt->bindValue(1, "%$srchField%", PDO::PARAM_STR); 
$stmt->execute(); 
$result = $stmt->fetchAll(); 
print_r($result); 

各运营商/标识符必须是硬编码的，但如果不区分你需要验证标识